Anti-microbial compounds includes

  • antiseptic
  • disinfectants
  • both a and b
  • antibiotics

A bacterial cell lacks

  • flagella
  • chromosome
  • cell wall
  • nucleus

The introduction of dead or weak germs in to body orally or by injection to train body to fight the real germs on attack is called

  • vaccination
  • immunization
  • both a and b
  • infecting

Unicellular microscopic fungi are

  • yeast
  • mould
  • toadstool
  • penicillium

The deadly disease which is caused by a parasitic micro-organism called plasmodium is

  • Malaria
  • Dengue
  • Polio
  • Rubella

Germs spread in the form of

  • clusters
  • droplets
  • gases
  • air

The vectors which conduct germs includes

  • fleas
  • tick
  • lice
  • all of them

Polio can lead to

  • paralysis
  • nervous system distracted
  • both a and b
  • eye diseases

Bacteria are

  • non-living
  • unicellular organisms
  • multicellular organisms
  • complex organisms

The bacteria which have ability to convert milk sugar in to lactic acid is called

  • lactobacillus
  • streptococcus
  • gram positive bacteria
  • gram negative bacteria

To fight against diseases human beings have special

  • natural barriers
  • immune system
  • both a and b
  • antibiotics

Viruses are not regarded as living things because they cannot

  • survive
  • reproduce
  • attack host cell
  • invade

Ability to eat away germ is specialty of

  • red blood cell
  • white blood cell
  • liver
  • plasma

Female anopheles mosquito spread

  • Malaria
  • Dengue
  • Polio
  • Rubella

Bacterial diseases includes

  • diphtheria
  • SARS
  • small pox
  • dengue fever

Diseases which are caused by micro-organisms are called

  • contagious
  • venereal
  • infectious
  • incurable

A medicine which contain dead or weakened germs is used to prevent infectious disease is called a

  • antiseptic
  • antibodies
  • antibiotics
  • vaccine

Viruses are made up of

  • DNA
  • RNA
  • protein coat
  • all of them

Transfusion of infected blood is main reason for spread of diseases like

  • AIDS
  • Hepatitis B
  • both a and b
  • Polio

The use of organisms specially micro-organisms in the manufacture or industrial processes is called

  • biotechnology
  • bioengineering
  • chemical process
  • genetic engineering
If the invisible world around you became visible, what might you see?
  • Things that are normally hidden from sight
  • Only bright lights
  • Just empty space
  • Nothing unusual
Observing the hidden world might change the way you think about size, complexity, or what counts as 'living'. What is a likely effect of such observation?
  • It can expand your understanding of what is considered 'living' and reveal unexpected complexity in small organisms.
  • It will make you believe that only large organisms are complex.
  • It will convince you that size is the only factor in determining life.
  • It will show that all living things are simple and easy to understand.
Have you thought how these tiny living beings interact with each other?
  • They communicate and affect each other's survival.
  • They ignore each other completely.
  • They only compete for food and never cooperate.
  • They live in isolation without any interaction.
Share your questions
  • You can share your questions.
  • You cannot share your questions.
  • Questions cannot be shared.
  • Sharing questions is not allowed.
What is this curved piece of glass called?
  • Lens
  • Mirror
  • Prism
  • Glass sheet
All living beings, whether plants or animals, are called ________.
  • organisms
  • minerals
  • machines
  • objects
You might have seen some people using reading glasses. How does it help them see better? Or what happens when we use a magnifying glass to observe something?
  • Reading glasses and magnifying glasses help by making objects appear larger and clearer.
  • Reading glasses and magnifying glasses change the color of objects.
  • Reading glasses and magnifying glasses make objects appear farther away.
  • Reading glasses and magnifying glasses make objects invisible.
Activity 2.1: Let us observe Take a round-bottom flask made up of glass as shown in Fig. 2.1. Fill it with water. Close the mouth of the flask with a cork. Now, place the flask on an open book and look at the letters through it. What happens to the appearance of the letters when seen through the flask filled with water?
  • The letters appear larger.
  • The letters appear smaller.
  • The letters become blurry.
  • The letters disappear completely.
For a long time, people were curious to explore the tiny organisms around them, but they could not see them with their naked eyes. So, how did we finally discover this invisible world? Do you know which scientific discovery helped us see the tiny world for the first time?
  • The invention of the microscope
  • The discovery of electricity
  • The development of the telescope
  • The creation of the steam engine
In 1665, a scientist named Robert Hooke published a book called Micrographia. What tool did he use to observe tiny things that people had never seen before?
  • Telescope
  • Microscope
  • Magnifying glass
  • Binoculars
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